Question

我有一个按钮来显示有关客户的记录或信息，我刚刚注意到这个问题，当我选择提供所有必要信息的客户时，有关该特定客户的信息显示正确，现在当我尝试显示其他客户信息，其中包含一些缺少的字段，此时此特定客户的缺失字段被以前的客户信息所取代，这意味着我需要一种方法来清除文本框，然后才显示客户信息。这是我的方法显示信息。

public void ShowCustomerInformationCat1()
        {
            if (customer.cCustomerType != null)
            {
                ModifyCustomerByCategoryddlCustomerType.SelectedIndex = ModifyCustomerByCategoryddlCustomerType.Items.IndexOf(ModifyCustomerByCategoryddlCustomerType.Items.FindByText(customer.cCustomerType.Trim()));
                ModifyCustomerByCategoryddlNewCustomerType.SelectedIndex = ModifyCustomerByCategoryddlNewCustomerType.Items.IndexOf(ModifyCustomerByCategoryddlNewCustomerType.Items.FindByText(customer.cCustomerType.Trim()));
            }
            if (customer.cInitial != null)
            {
                ModifyCustomerByCategoryddlInitial.SelectedIndex = ModifyCustomerByCategoryddlInitial.Items.IndexOf(ModifyCustomerByCategoryddlInitial.Items.FindByText(customer.cInitial.Trim()));
                ModifyCustomerByCategoryddlNewInitial.SelectedIndex = ModifyCustomerByCategoryddlNewInitial.Items.IndexOf(ModifyCustomerByCategoryddlNewInitial.Items.FindByText(customer.cInitial.Trim()));
            }
            if (customer.cGender != null)
            {
                ModifyCustomerByCategoryddlGender.SelectedIndex = ModifyCustomerByCategoryddlGender.Items.IndexOf(ModifyCustomerByCategoryddlGender.Items.FindByText(customer.cGender.Trim()));
                ModifyCustomerByCategoryddlNewGender.SelectedIndex = ModifyCustomerByCategoryddlNewGender.Items.IndexOf(ModifyCustomerByCategoryddlNewGender.Items.FindByText(customer.cGender.Trim()));
            }
            if (customer.cCountry != null)
            {
                ModifyCustomerByCategoryddlCountry.SelectedIndex = ModifyCustomerByCategoryddlCountry.Items.IndexOf(ModifyCustomerByCategoryddlCountry.Items.FindByText(customer.cCountry.Trim()));
                ModifyCustomerByCategoryddlNewCountry.SelectedIndex = ModifyCustomerByCategoryddlNewCountry.Items.IndexOf(ModifyCustomerByCategoryddlNewCountry.Items.FindByText(customer.cCountry.Trim()));
            }
}

有人可以建议我如何清除文本框，我不想单独清除它们。感谢您的任何建议。

Answer 1

foreach (var item in Page.Controls)
        {
            if (item is TextBox)
            {
                ((TextBox)item).Text = "";
            }
        }

Answer 2

试试这样。

foreach (var obj in Page.Controls.OfType<TextBox>())
{
   obj.Text="";
}

Answer 3

试试这个：

Control myForm = Page.FindControl("Form1.aspx"); 
foreach (Control ctl in myForm.Controls) 
if (ctl.GetType().ToString().Equals("System.Web.UI.WebControls.TextBox")) 
((TextBox)ctl).Text = "";

Answer 4

private void SetTxtChildren(Control ParentControl,string NewValue = "", Boolean Enable = true)
    {
        foreach (Control c in ParentControl.Controls)
        {
            if (c is TextBox)
            {
                ((TextBox)c).Enabled = Enable;
                ((TextBox)c).Text = NewValue;
            }else if(c.Controls.Count >0)
            {
                ClearTxtChildren(c, Enable);
            }
        }
    }

其他答案确实是正确的，但此代码还将设置作为子项的子项的文本框。基本递归将在具有自己的子控件的任何子控件上运行相同的循环。这样，您可以在特定控件及其子控件（如手风琴或内容块）中设置所有文本框。

Answer 5

对于levi的解决方案几乎没有更新，在我的场景中我只想清除名为grdDetails的网格控件中的特定texbox。使用fw 4.0和wpf

        foreach (var item in grdDetails.Children)
        {
            if (item is TextBox)
            {
                ((TextBox)item).Text = "";
            }
        }

Answer 6

 protected void Button1_Click(object sender, EventArgs e)
        {

                ClearSection();
               //Rest of your code
        }

   private void  function ClearSection()
        {
        foreach (Control cntrl in Page.Controls)
            {
                if (cntrl is TextBox)
                {
                  ((TextBox)cntrl).Text = "";

                }
            }
        }

Answer 7

 private void  function ClearSection()
    {
    foreach (Control cntrl in Page.Controls)
        {
            if (cntrl is TextBox)
            {
              ((TextBox)cntrl).Text = "";

            }
        }
    }

Answer 8

而不是使用那么多行代码。你可以通过一个代码来解决它将文本框值设置为null属性。

见这里

protected void btnSubmit_Click(object sender, EventArgs e)
    {
        DataTable dt;
        USignUp USignUp = new USignUp();
        DateTime DOB;


        try
        {
            if (chkAccept.Checked == true)
            {
                DOB = Convert.ToDateTime(txtDOB.Text);
                int UserTypeId = 1;
                USignUp.SignUp_Insert(txtEmail.Text, txtPwd.Text, txtUFName.Text, txtULName.Text, txtCInfo.Text,
                     DOB, UserTypeId);
                txtEmail.Text = "";
                txtPwd.Text = "";

                txtUFName.Text = "";
                txtULName.Text = "";
                txtCInfo.Text = "";
                txtCnfrEmail.Text = "";
                txtDOB.Text = "";
                txtCnfrmPwd.Text = "";
            }
            else
            {
                lblMessage.Visible = true;
                lblMessage.Text = "Please accept the terms and conditions";
                //Response.Write("<script LANGUAGE='JavaScript' >alert('Please select Checkbox');document.location='" + ResolveClientUrl("~/SignUp.aspx") + "';</script>");
            }

        }
        catch
        {
        }
    }//It works.You can Know more on this by clicking to http://transinntech.com/

Answer 9

    protected void Button1_Click(object sender, EventArgs e)
    {
            refresh(this);
    }

    public void refresh(Control cont)
    {
            foreach (Control x in cont.Controls)
            {
                if ((x.GetType() == typeof(TextBox)))
                {

                    ((TextBox)(x)).Text = "";
                }

                if (x.HasControls())
                {
                    CleartextBoxes(x);
                }
            }
    }

如何清除Asp.Net按钮上所有文本框的值单击

9 个答案: